Here we have 3 env. Production,DR and Reporting physically on separate machines.
Production and DR are working fine...configured via dataguard.
Reporting instance is synchronized via streams.

At production "archivelog all delete all input" is set in RMAN script.
Befor we added Reporting instance archivelogs were removing from Production after backup is completed.
But since we added Reporing instance, Redo logs are shipped from Production to Reporting (and changes applied) but archivlogs are not deleted after backup is completed at Production.